Yes, you can do it. No, I wouldn’t tho.
Maybe bump it up to 18.. or 20 max (in my opinion). Plants need rest man. I ran all my autos at 18 thru the entire cycle.
It will not trigger re-vegetation, that’s not possible with proper autoflower genetics.
Causing herm? Doubt it. But you never know.
I would have run 20/4 or 24/0 early in Veg if you’re gonna do it. I personally Do not like the idea of running veg at a lower light cycle than in flower.. goes against natural light cycles.